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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: Schemas.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.core;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.collect.Iterables;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Arrays;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.util.Collections;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import java.util.HashMap;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import java.util.Iterator;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import java.util.Map;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import java.util.SortedMap;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import java.util.TreeMap;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.TreeSet;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>/**<a name="line.21"></a>
<span class="sourceLineNo">022</span> * Contains the set of all {@link Schema}s of objects visible in a {@link Transaction}.<a name="line.22"></a>
<span class="sourceLineNo">023</span> * All database objects have an implicit schema version number, which corresponds to one of the {@link Schema}s<a name="line.23"></a>
<span class="sourceLineNo">024</span> * contained here and describes the object's fields.<a name="line.24"></a>
<span class="sourceLineNo">025</span> *<a name="line.25"></a>
<span class="sourceLineNo">026</span> * &lt;p&gt;<a name="line.26"></a>
<span class="sourceLineNo">027</span> * Associated with a {@link Transaction} is a {@linkplain Transaction#getSchema specific schema version}<a name="line.27"></a>
<span class="sourceLineNo">028</span> * that the transaction uses to access objects.<a name="line.28"></a>
<span class="sourceLineNo">029</span> * &lt;/p&gt;<a name="line.29"></a>
<span class="sourceLineNo">030</span> */<a name="line.30"></a>
<span class="sourceLineNo">031</span>public class Schemas {<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>    final TreeMap&lt;Integer, Schema&gt; versions = new TreeMap&lt;&gt;();<a name="line.33"></a>
<span class="sourceLineNo">034</span>    final TreeMap&lt;Integer, StorageInfo&gt; storageInfos = new TreeMap&lt;&gt;();<a name="line.34"></a>
<span class="sourceLineNo">035</span>    final TreeMap&lt;Integer, TreeSet&lt;Integer&gt;&gt; indexedFieldToContainingTypesMap = new TreeMap&lt;&gt;();<a name="line.35"></a>
<span class="sourceLineNo">036</span>    final TreeSet&lt;Integer&gt; objTypeStorageIds = new TreeSet&lt;&gt;();<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    Schemas(SortedMap&lt;Integer, Schema&gt; versions) {<a name="line.38"></a>
<span class="sourceLineNo">039</span>        this.initialize(versions);<a name="line.39"></a>
<span class="sourceLineNo">040</span>    }<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    private void initialize(SortedMap&lt;Integer, Schema&gt; versions) {<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>        // Sanity check<a name="line.44"></a>
<span class="sourceLineNo">045</span>        if (versions == null)<a name="line.45"></a>
<span class="sourceLineNo">046</span>            throw new IllegalArgumentException("null versions");<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>        // Verify Versions have the right version numbers<a name="line.48"></a>
<span class="sourceLineNo">049</span>        for (Map.Entry&lt;Integer, Schema&gt; entry : versions.entrySet()) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>            final int versionNumber = entry.getKey();<a name="line.50"></a>
<span class="sourceLineNo">051</span>            final Schema schema = entry.getValue();<a name="line.51"></a>
<span class="sourceLineNo">052</span>            if (schema == null)<a name="line.52"></a>
<span class="sourceLineNo">053</span>                throw new IllegalArgumentException("null schema");<a name="line.53"></a>
<span class="sourceLineNo">054</span>            if (schema.versionNumber != versionNumber) {<a name="line.54"></a>
<span class="sourceLineNo">055</span>                throw new InvalidSchemaException("schema version at index "<a name="line.55"></a>
<span class="sourceLineNo">056</span>                  + versionNumber + " has version " + schema.versionNumber);<a name="line.56"></a>
<span class="sourceLineNo">057</span>            }<a name="line.57"></a>
<span class="sourceLineNo">058</span>        }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>        // Reset state<a name="line.60"></a>
<span class="sourceLineNo">061</span>        this.versions.clear();<a name="line.61"></a>
<span class="sourceLineNo">062</span>        this.storageInfos.clear();<a name="line.62"></a>
<span class="sourceLineNo">063</span>        this.indexedFieldToContainingTypesMap.clear();<a name="line.63"></a>
<span class="sourceLineNo">064</span>        this.objTypeStorageIds.clear();<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>        // Copy versions<a name="line.66"></a>
<span class="sourceLineNo">067</span>        this.versions.putAll(versions);<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>        // Verify all schema versions use storage IDs in a compatible way<a name="line.69"></a>
<span class="sourceLineNo">070</span>        final HashMap&lt;StorageInfo, Integer&gt; versionMap = new HashMap&lt;&gt;();<a name="line.70"></a>
<span class="sourceLineNo">071</span>        for (Schema version : this.versions.values()) {<a name="line.71"></a>
<span class="sourceLineNo">072</span>            for (Map.Entry&lt;Integer, StorageInfo&gt; entry : version.storageInfoMap.entrySet()) {<a name="line.72"></a>
<span class="sourceLineNo">073</span>                final int storageId = entry.getKey();<a name="line.73"></a>
<span class="sourceLineNo">074</span>                final StorageInfo current = entry.getValue();<a name="line.74"></a>
<span class="sourceLineNo">075</span>                final StorageInfo previous = this.storageInfos.put(storageId, current);<a name="line.75"></a>
<span class="sourceLineNo">076</span>                if (previous != null &amp;&amp; !previous.equals(current)) {<a name="line.76"></a>
<span class="sourceLineNo">077</span>                    throw new InvalidSchemaException("incompatible use of storage ID " + storageId + " for both "<a name="line.77"></a>
<span class="sourceLineNo">078</span>                      + previous + " in schema version " + versionMap.get(previous) + " and "<a name="line.78"></a>
<span class="sourceLineNo">079</span>                      + current + " in schema version " + version.versionNumber);<a name="line.79"></a>
<span class="sourceLineNo">080</span>                }<a name="line.80"></a>
<span class="sourceLineNo">081</span>                versionMap.put(current, version.versionNumber);<a name="line.81"></a>
<span class="sourceLineNo">082</span>            }<a name="line.82"></a>
<span class="sourceLineNo">083</span>        }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>        // Gather all object type storage IDs<a name="line.85"></a>
<span class="sourceLineNo">086</span>        for (Schema version : this.versions.values()) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>            for (ObjType objType : version.objTypeMap.values())<a name="line.87"></a>
<span class="sourceLineNo">088</span>                objTypeStorageIds.add(objType.storageId);<a name="line.88"></a>
<span class="sourceLineNo">089</span>        }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span>        // Calculate, for each simple field, the storage ID's of all types in which, for some schema version,<a name="line.91"></a>
<span class="sourceLineNo">092</span>        // the field exists and is indexed.<a name="line.92"></a>
<span class="sourceLineNo">093</span>        for (Schema version : this.versions.values()) {<a name="line.93"></a>
<span class="sourceLineNo">094</span>            for (ObjType objType : version.objTypeMap.values()) {<a name="line.94"></a>
<span class="sourceLineNo">095</span>                for (SimpleField&lt;?&gt; field : Iterables.filter(objType.getFieldsAndSubFields(), SimpleField.class)) {<a name="line.95"></a>
<span class="sourceLineNo">096</span>                    if (!field.indexed)<a name="line.96"></a>
<span class="sourceLineNo">097</span>                        continue;<a name="line.97"></a>
<span class="sourceLineNo">098</span>                    TreeSet&lt;Integer&gt; containingTypes = this.indexedFieldToContainingTypesMap.get(field.storageId);<a name="line.98"></a>
<span class="sourceLineNo">099</span>                    if (containingTypes == null) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>                        containingTypes = new TreeSet&lt;&gt;();<a name="line.100"></a>
<span class="sourceLineNo">101</span>                        this.indexedFieldToContainingTypesMap.put(field.storageId, containingTypes);<a name="line.101"></a>
<span class="sourceLineNo">102</span>                    }<a name="line.102"></a>
<span class="sourceLineNo">103</span>                    containingTypes.add(objType.storageId);<a name="line.103"></a>
<span class="sourceLineNo">104</span>                }<a name="line.104"></a>
<span class="sourceLineNo">105</span>            }<a name="line.105"></a>
<span class="sourceLineNo">106</span>        }<a name="line.106"></a>
<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    /**<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * Verify the given storage ID has the specified type of {@link StorageInfo} and find it.<a name="line.110"></a>
<span class="sourceLineNo">111</span>     *<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * @param storageId schema object storage ID<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * @param expectedType expected {@link StorageInfo} type<a name="line.113"></a>
<span class="sourceLineNo">114</span>     * @return the actual {@link StorageInfo} instance found<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * @throws UnknownFieldException if type doesn't match and {@code expectedType} is a {@link FieldStorageInfo} sub-type<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * @throws UnknownIndexException if type doesn't match and {@code expectedType} is {@link CompositeIndexStorageInfo}<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * @throws UnknownTypeException if type doesn't match and {@code expectedType} is {@link ObjectStorageInfo}<a name="line.117"></a>
<span class="sourceLineNo">118</span>     */<a name="line.118"></a>
<span class="sourceLineNo">119</span>    &lt;T extends StorageInfo&gt; T verifyStorageInfo(int storageId, Class&lt;T&gt; expectedType) {<a name="line.119"></a>
<span class="sourceLineNo">120</span>        final StorageInfo storageInfo = this.storageInfos.get(storageId);<a name="line.120"></a>
<span class="sourceLineNo">121</span>        if (storageInfo != null &amp;&amp; expectedType.isInstance(storageInfo))<a name="line.121"></a>
<span class="sourceLineNo">122</span>            return expectedType.cast(storageInfo);<a name="line.122"></a>
<span class="sourceLineNo">123</span>        String message = "no " + this.getDescription(expectedType) + " with storage ID " + storageId + " exists";<a name="line.123"></a>
<span class="sourceLineNo">124</span>        if (storageInfo != null)<a name="line.124"></a>
<span class="sourceLineNo">125</span>            message += " (found " + storageInfo + " instead)";<a name="line.125"></a>
<span class="sourceLineNo">126</span>        if (FieldStorageInfo.class.isAssignableFrom(expectedType))<a name="line.126"></a>
<span class="sourceLineNo">127</span>            throw new UnknownFieldException(storageId, message);<a name="line.127"></a>
<span class="sourceLineNo">128</span>        if (ObjTypeStorageInfo.class.isAssignableFrom(expectedType))<a name="line.128"></a>
<span class="sourceLineNo">129</span>            throw new UnknownTypeException(storageId, 0, message);<a name="line.129"></a>
<span class="sourceLineNo">130</span>        if (CompositeIndexStorageInfo.class.isAssignableFrom(expectedType))<a name="line.130"></a>
<span class="sourceLineNo">131</span>            throw new UnknownIndexException(storageId, message);<a name="line.131"></a>
<span class="sourceLineNo">132</span>        throw new IllegalArgumentException(message);                        // should never get here<a name="line.132"></a>
<span class="sourceLineNo">133</span>    }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>    boolean deleteVersion(int version) {<a name="line.135"></a>
<span class="sourceLineNo">136</span>        final TreeMap&lt;Integer, Schema&gt; newVersions = new TreeMap&lt;&gt;(this.versions);<a name="line.136"></a>
<span class="sourceLineNo">137</span>        if (newVersions.remove(version) == null)<a name="line.137"></a>
<span class="sourceLineNo">138</span>            return false;<a name="line.138"></a>
<span class="sourceLineNo">139</span>        this.initialize(newVersions);<a name="line.139"></a>
<span class="sourceLineNo">140</span>        return true;<a name="line.140"></a>
<span class="sourceLineNo">141</span>    }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>    private String getDescription(Class&lt;? extends StorageInfo&gt; type) {<a name="line.143"></a>
<span class="sourceLineNo">144</span>        if (FieldStorageInfo.class.isAssignableFrom(type))<a name="line.144"></a>
<span class="sourceLineNo">145</span>            return type.getSimpleName().replaceAll("^(.*)Field.*$", "$1").toLowerCase() + " field";<a name="line.145"></a>
<span class="sourceLineNo">146</span>        if (ObjTypeStorageInfo.class.isAssignableFrom(type))<a name="line.146"></a>
<span class="sourceLineNo">147</span>            return "object type";<a name="line.147"></a>
<span class="sourceLineNo">148</span>        if (CompositeIndexStorageInfo.class.isAssignableFrom(type))<a name="line.148"></a>
<span class="sourceLineNo">149</span>            return "composite index";<a name="line.149"></a>
<span class="sourceLineNo">150</span>        return type.getSimpleName();    // ???<a name="line.150"></a>
<span class="sourceLineNo">151</span>    }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span>// Accessors<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span>    /**<a name="line.155"></a>
<span class="sourceLineNo">156</span>     * Get all schema versions.<a name="line.156"></a>
<span class="sourceLineNo">157</span>     *<a name="line.157"></a>
<span class="sourceLineNo">158</span>     * @return unmodifiable map of {@link Schema}s indexed by version number<a name="line.158"></a>
<span class="sourceLineNo">159</span>     */<a name="line.159"></a>
<span class="sourceLineNo">160</span>    public SortedMap&lt;Integer, Schema&gt; getVersions() {<a name="line.160"></a>
<span class="sourceLineNo">161</span>        return Collections.unmodifiableSortedMap(this.versions);<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    /**<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * Get the {@link Version} corresponding to the given version number.<a name="line.165"></a>
<span class="sourceLineNo">166</span>     *<a name="line.166"></a>
<span class="sourceLineNo">167</span>     * @param versionNumber schema version number<a name="line.167"></a>
<span class="sourceLineNo">168</span>     * @return schema with version number {@code versionNumber}<a name="line.168"></a>
<span class="sourceLineNo">169</span>     * @throws IllegalArgumentException if {@code versionNumber} is not known<a name="line.169"></a>
<span class="sourceLineNo">170</span>     */<a name="line.170"></a>
<span class="sourceLineNo">171</span>    public Schema getVersion(int versionNumber) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>        final Schema schema = this.versions.get(versionNumber);<a name="line.172"></a>
<span class="sourceLineNo">173</span>        if (schema == null)<a name="line.173"></a>
<span class="sourceLineNo">174</span>            throw new IllegalArgumentException("unknown version " + versionNumber);<a name="line.174"></a>
<span class="sourceLineNo">175</span>        return schema;<a name="line.175"></a>
<span class="sourceLineNo">176</span>    }<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span>    // See if we match encoded schemas read from KV transaction<a name="line.178"></a>
<span class="sourceLineNo">179</span>    boolean isSameVersions(SortedMap&lt;Integer, byte[]&gt; bytesList) {<a name="line.179"></a>
<span class="sourceLineNo">180</span>        if (bytesList.size() != this.versions.size())<a name="line.180"></a>
<span class="sourceLineNo">181</span>            return false;<a name="line.181"></a>
<span class="sourceLineNo">182</span>        final Iterator&lt;Map.Entry&lt;Integer, byte[]&gt;&gt; i1 = bytesList.entrySet().iterator();<a name="line.182"></a>
<span class="sourceLineNo">183</span>        final Iterator&lt;Map.Entry&lt;Integer, Schema&gt;&gt; i2 = this.versions.entrySet().iterator();<a name="line.183"></a>
<span class="sourceLineNo">184</span>        while (i1.hasNext() || i2.hasNext()) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>            if (!i1.hasNext() || !i2.hasNext())<a name="line.185"></a>
<span class="sourceLineNo">186</span>                return false;<a name="line.186"></a>
<span class="sourceLineNo">187</span>            final Map.Entry&lt;Integer, byte[]&gt; entry1 = i1.next();<a name="line.187"></a>
<span class="sourceLineNo">188</span>            final Map.Entry&lt;Integer, Schema&gt; entry2 = i2.next();<a name="line.188"></a>
<span class="sourceLineNo">189</span>            if (entry1.getKey() != entry2.getKey() || !Arrays.equals(entry1.getValue(), entry2.getValue().encodedXML))<a name="line.189"></a>
<span class="sourceLineNo">190</span>                return false;<a name="line.190"></a>
<span class="sourceLineNo">191</span>        }<a name="line.191"></a>
<span class="sourceLineNo">192</span>        return true;<a name="line.192"></a>
<span class="sourceLineNo">193</span>    }<a name="line.193"></a>
<span class="sourceLineNo">194</span>}<a name="line.194"></a>
<span class="sourceLineNo">195</span><a name="line.195"></a>




























































</pre>
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